Brake shoe



June 1925- 1,540,278

(2. D. PETTIS BRAKE SHOE Original Filed Dec. 6. 1925 2 Sheets-Sheet l Ill/Ill June 2, 1925.

c. D. PETTIS BRAKE SHOE" Original Filed D90- 6. 1923 2 Sheets-Sheet 2 Cay/07; 17. @VMMW .QQ \1 0M Patented June 2, 1925.

UNITED STATES CLIFTON I). PETTIS, OF NEW YORK, N. Y.

BRAKE SHOE.

Original application filed December 6, 1923, Serial No. 678,793. Divided and this application filed June 7, 1924. Serial No. 718,445.

To all whom it may concern:

Be it known that I, CLIFTON D. Pn'r rrs, a citizen of the United States, residing in New York, in the county of New York and tate of New York, have invented certain new and useful Improvements in Brake Shoes, of which the following is a specilication.

This invention relates to brake shoes, but

more particularly to that type which has a shell of tough ductile metal incorporated in the cast body of the shoe. The primary object of the invention is to provide a simple and economical construction which is stronger and more durable than devices of a similar character heretofore known.

Further objects are to anchor thedownwardly projecting side and end walls of the shell within the body metal of the shoe, to

29 more securely hold the body metal portion within the shell, to protect the reticulated side and end walls of the shell, to increase the strength of the shell and therefore of the brake shoe without increasing the wear on the wheel, and in general to provide an improved brake shoe.

The many other objects and advantages of my invention will be better understood by reference to the following specification when :10 considered in connection with the accompanying drawings illustrating certain se looted embodiments thereof, in which Fig. 1 is a side elevation of an improved brake shoe. 5 Fig. 2 is a top plan view of a shell blank. Fig. 3 is the same as Fig. 2, the shell bejug recticulated.

Fig. 4 is a transverse sectionalview of the shoe shown in Fig. 1 40 Fig. 5 is a longitudinal sectional View of a portion of the shoe shown in Fig. 1.

Fig. 6 is a transverse sectional View of the blank shown in Fig. 2.

Fig. 7 is a transverse sectional view of a modified form of blank.

Fig. 8 is a top plan view of a modified form of blank.

Fig. 9 is a transverse sectional View of a flanged brake shoe incorporating a shell formed from a blank such as that shown in Fig. 8, and

Figs. 10, 11 and 12 are transverse sectional views of modified forms of brake shoes.

Referring to the drawings and particularly to Figs. 1 to 6 inclusive, the brake shoe comprises a pan or shell 15 preferably of tough ductile metal, a cast body 16, a key lug 17 and end lugs 18.

In the present embodiment the shell 15 is formed from a blank such as 19 (Figs. 2 and 6) having arelatively thick central portion 20 and a thinner edge portion 21. The edge portion ofthe blank is then perforated or otherwise reticulated as at22 (Fig. 3). Openings as 23 and 24 may be provided in the shell for key and end lugs respectively. The reduction in thickness of the blank in the present "embodiment takes place wholly on the top: or outer face thereof, leaving the under or inner face fiat as illustrated. The outer face of the edgeportion is thus offset from the corresponding face of the thicker or central portion of the blank. The reasons for this will be presently described. This reduction may be abrupt,substantially as at 25 (Fig. 6) or gradual, substantially as at'26 (Fig. 7).

The reticulated blank 19 is next bent substantially on the, dotted line 27 (Fig. 3), into the usual pan shaped (Fig. 1). This line is located within the portion 20 of the blank so that the thick metalextends around the bend substantially as indicated in Fig". l and 5. This'provides a channel shape which is of the thickest section of the shell and thus gives great strength to the shell. At the same time the portions of the thick part of the shell do not extend to such a depth as to come into contact with the wheel. It is contemplated that the shoe will be removed from service before the same has worn beyond the thinner portions of the shell.

The offsetting of the outer face of the thin portion of the shell from the corresponding face of the adjoining. thicker portion in the manner described leaves a space which is filled by the body metal of the shoe during the casting operation as indicated at 28. Thus the thin portions of the sides and ends of the shell are surrounded by the body metal of the shoe and all are securely held together by the metal extending through the perforations or reticulations in the shell as at 29. The downwardly projecting sides and end walls are anchored within the body metal of the shoe. Furthermore, the bodx metal on the outer face of each of these Jun walls protects the walls. This construction is of especialvalue when the shoe is worn thin.

In Fig. 8 of the drawings is illustrated a blank 30 for a shell particularly designed for use in a brake shoe forlocomotive driving wheels. Here the thin portion 31 only extends about one side and both ends of the thicker portion 32. A section of a completed shoe 33 of this type is shown i-nFig. 9. The portion A of the back which extends over theflange does not come in contact with the wheel andconscquently need not be of thinner sect-ion.

' In Fig. 10 of the drawings is illustrated a modified form of shell in which the walls are of uniform thickness a id the depending portions 35 are bent inwardly as at 36in provide offset port-ionsST. The bodymetal of the shoe flows into the space 38 outside of the offset portions of the shell and thus causes these portions to be surrounded by this metal with the beneficial results previously described. The metal in the space 38 is united to the body of the shoe through the reticulations 39. In this embodiment the body metal of the shoe extends beyond the inside face of the depending portions 37 of the shell as at 88, and thus makes an anchorage which more securely holds the body metalin tllQgSllGll. This is. of especial advantage when the shoe isworn thin.

In Figll isshown a further modification in which the shell lOis composed of a thick central portion il and, thin edge portions 42, but this (litters-from the embodiment similarly illustrated in Fig. 4c inthat the reduction in thickness of the shell takes place upon the inner or under face. Theportions 42 of the shell are flush with the corresponding faces of thebody. of the shoe.

In Fig. 12 is illustrated a further modification in which the depending walls l-Ll are-of relatively thin metal and bent iuwardly, at ll, as in the embodiment shown in Fig. L). The portion of the shell 2.1145 is of relatively thick metal but this thicker portion does not extend about the bend.

It will be evident from the foregoing description that my improved brake shoe is simple and economical in construction and stronger and more durablethan those of a similar character heretofore produced. The additional strength provided by the extension of the thick metal about the bend d es not result in increased wear upon the rim of the wheel as would be the case if the entire shell were made of such metal. The

offsetting of the depending portions of the shell insures a better connection between the shell and body metal of the shoe and eliminates curling or rolling of the shell.

This application is a division of my copending application Serial No. 678,793, filed December 6, 1923, for brake shoes.

I have selected various embodiments of my invention to fully illustrate the principles involved but itshould be distinctly understood that this is for the purpose of illust .ation-and not limitation, for I am aware that the form and arrangement may be materially changed without departing from the spirit. of-my invention and I re servetherright to make all such changes as fairly fall within the scope of the following claims. I

I claim as my invention:

1. In a brake shoe, a reinforcing shell comprising a back and depending side walls, the lowerportion of said side walls being bent inwardly to provide an offset therein.

2-. Ina brake shoe', a reinforcing shell comprising a back and'reticulated side walls depending therefrom, the lower portion of said walls being bent inwardly to provide an offset therein.

3. In a'brake shoe, La reinforcing shell comprising'a back, sides and end walls,the lowerportion of said sides and end walls being bent inwardly to provide an offset therein. i

l. In a brake shoe, the combination with a cast metal body, of a reinforcing shell incorporated. therein and comprising aback and reticulated side walls, the lower portion of said walls being bent inwardly to provide an ofiset therein and the metal cit-the bod surrounding said offset portion and extending through the 'reticulations therein.

on rrou n. Farris. 

